After 300,000,000 years, insects have arrived. In our consciousness at least, or so says the curator and ecologist Bridget Nicholls, director of something called Pestival and a woman with an undying fervor for all things insectoid. After much success at a smaller venue in 2006, Pestival was invited this year, by Jude Kelly, to take place in the Southbank Centre, of which she is artistic director. The festival’s mandate: to celebrate insects in art and, while it’s about it, to celebrate the art of being an insect.